Series::sspec PadeApproximant::sspec

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This message is generated when the second argument in Series does not have the expected form.
The second argument in Series is expected to be a list giving the expansion variable, the expansion point, and the number of terms to compute.
Off[message] switches off the message; On[message] switches it on. For example: Off[PadeApproximant::sspec].

An error occurs because the second argument is a symbol rather than a list with three elements:

This shows valid arguments in Series:

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